US3559688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fluid pressure regulating valve
Assignee: Mack Trucks Inc
•
Filing: 1969-05-05
•
Granted: 1971-02-02
•
Expires: 1989-05-05
Abstract
Abstract A fluid pressure regulating valve having a control port, an inlet port, an outlet port and an exhaust port, an inlet valve disposed between the inlet and outlet ports, and a reciprocable piston having a hollow stem extending toward and adapted to engage and open the inlet valve in one position and to disengage the inlet valve to close the same in another position, the piston having an exhaust passage extending from the hollow stem to a location adjacent the exhaust port which is closed when the hollow stem engages the inlet valve and which is opened when the stem disengages the inlet valve.
Inventors
- 👤 Alvin M Fischer
- 👤 Harry J Warmkessel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
B; B60; B60G; B60G17/00; B60G17/02; B60G17/04; B60G17/052; G; G05; G05D; G05D16/00; G05D16/04; G05D16/10; G05D16/101; G05D16/14; G05D16/18; G05D16/187; Y; Y10; Y10T; Y10T137/00; Y10T137/8593; Y10T137/86919
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
294 words
A dump valve for an air spring system comprising: a valve casing defining a cylindrical bore adapted to receive a piston and having a stop in the lower middle portion thereof adapted to limit the travel of such piston and an outlet port in the side thereof below the stop for connection to the air spring and an exhaust port in the side above the stop; threaded caps covering each end of the bore, the top cap having a control port for connection with a dump valve pressure control system and the bottom cap having an inlet port for connection with a leveling valve system; an inlet port for connection with a leveling valve system; an inlet valve disposed in the lower portion of the bore below the stop between the inlet and outlet ports; a double headed piston valve plug reciprocally disposed in the bore above the stop adjacent to the exhaust port between the outlet and control ports, the piston valve plug having an upper piston connected to a lower piston by a tubular stem which extends downwardly toward the valve disc and defines a passage from the lower end of the stem into the central portion of the piston assembly and out the side thereof between the pistons adjacent to the exhaust port and which engages the valve disc to close the exhaust passage and open the inlet valve when the piston valve plug is in the lower portion of the bore and disengages the disc to close the inlet valve and open the exhaust passage when the piston valve plug is in the upper portion of the bore; and an adjustable spring member compressed between the upper cap and the piston and urging the piston downwardly toward the inlet valve.
Claim 2
Dependent Claim
294 words
A dump valve for an air spring system comprising: a valve casing defining a cylindrical bore adapted to receive a piston and having a stop in the lower middle portion thereof adapted to limit the travel of such piston and an outlet port in the side thereof below the stop for connection to the air spring and an exhaust port in the side above the stop; threaded caps covering each end of the bore, the top cap having a control port for connection with a dump valve pressure control system and the bottom cap having an inlet port for connection with a leveling valve system; an inlet port for connection with a leveling valve system; an inlet valve disposed in the lower portion of the bore below the stop between the inlet and outlet ports; a double headed piston valve plug reciprocally disposed in the bore above the stop adjacent to the exhaust port between the outlet and control ports, the piston valve plug having an upper piston connected to a lower piston by a tubular stem which extends downwardly toward the valve disc and defines a passage from the lower end of the stem into the central portion of the piston assembly and out the side thereof between the pistons adjacent to the exhaust port and which engages the valve disc to close the exhaust passage and open the inlet valve when the piston valve plug is in the lower portion of the bore and disengages the disc to close the inlet valve and open the exhaust passage when the piston valve plug is in the upper portion of the bore; and an adjustable spring member compressed between the upper cap and the piston and urging the piston downwardly toward the inlet valve.
Claim 3
Dependent Claim
267 words
A fluid pressure regulating valve comprising: a valve casing defining a cylindrical bore adapted to receive a piston and having a stop in the lower middle portion thereof adapted to limit the travel of such piston and a pressure outlet port in the side thereof below the stop and an exhaust port in the side above the stop; threaded caps covering each end of the bore, the top cap having a control port and the bottom cap having a pressure inlet port; an inlet valve disposed in the lower portion of the bore below the stop between the inlet and outlet ports and including a valve seat, a valve disc and a spring urging the disc toward the seat to close the bore between the inlet and outlet ports; and a double headed piston valve plug reciprocally disposed in the bore above the stop adjacent to the exhaust port between the outlet and control ports, the piston valve plug having an upper piston connected to a lower piston by a tubular stem which extends downwardly toward the valve disc and defines a passage from the lower end of the stem into the central portion of the piston assembly and out the side thereof between the pistons adjacent to the exhaust port and which engages the valve disc to close the exhaust passage and open the inlet valve when the piston valve plug is in the lower portion of the bore and disengages the disc to close the inlet valve and open the exhaust passage when the piston valve plug is in the upper portion of the bore.
Claim 4
Dependent Claim
267 words
A fluid pressure regulating valve comprising: a valve casing defining a cylindrical bore adapted to receive a piston and having a stop in the lower middle portion thereof adapted to limit the travel of such piston and a pressure outlet port in the side thereof below the stop and an exhaust port in the side above the stop; threaded caps covering each end of the bore, the top cap having a control port and the bottom cap having a pressure inlet port; an inlet valve disposed in the lower portion of the bore below the stop between the inlet and outlet ports and including a valve seat, a valve disc and a spring urging the disc toward the seat to close the bore between the inlet and outlet ports; and a double headed piston valve plug reciprocally disposed in the bore above the stop adjacent to the exhaust port between the outlet and control ports, the piston valve plug having an upper piston connected to a lower piston by a tubular stem which extends downwardly toward the valve disc and defines a passage from the lower end of the stem into the central portion of the piston assembly and out the side thereof between the pistons adjacent to the exhaust port and which engages the valve disc to close the exhaust passage and open the inlet valve when the piston valve plug is in the lower portion of the bore and disengages the disc to close the inlet valve and open the exhaust passage when the piston valve plug is in the upper portion of the bore.
Claim 5
Dependent Claim
21 words
The fluid pressure regulating valve according to claim 2, also including a spring urging the piston downwardly toward the inlet valve.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |